Doppler frequency shift determination method and device

A technology of Doppler shift and determination method, applied in the field of Doppler shift determination method and device, capable of solving problems such as poor accuracy of doppler shift estimation

Active Publication Date: 2020-07-07
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present invention provides a method and device for determining the Doppler frequency shift, so as to solve the problem of poor estimation accuracy of the doppler shift of the target cell caused by the interference of neighboring cells in the related art

Method used

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  • Doppler frequency shift determination method and device
  • Doppler frequency shift determination method and device

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Embodiment 1

[0042] In this embodiment, a method for determining Doppler frequency shift is provided. figure 1 It is a flowchart of a method for determining Doppler frequency shift according to an embodiment of the present invention, such as figure 1 As shown, the process includes the following steps:

[0043] Step S102: Determine an RB-level interference suppression matrix according to the RB-level channel estimation value of the resource block corresponding to the received signal and the RB-level noise covariance matrix corresponding to the signal after preset processing;

[0044] Step S104: Obtain an equivalent channel of the RB-level interference suppression matrix after combining in the space domain;

[0045] Step S106: Calculate the estimated value of the Doppler frequency shift at the port level and the user equipment UE level according to the equivalent channel.

[0046] Optionally, the channel estimation value of the RB level Determined by the following formula:

[0047]

[0048] among t...

Embodiment 2

[0161] In this embodiment, a device for determining a Doppler frequency shift is also provided. The device is used to implement the above-mentioned embodiments and preferred implementations, and what has been described will not be repeated. As used below, the term "module" may implement a combination of software and / or hardware with predetermined functions. Although the devices described in the following embodiments are preferably implemented by software, hardware or a combination of software and hardware is also possible and conceived.

[0162] figure 2 It is a structural block diagram of a device for determining Doppler frequency shift according to an embodiment of the present invention, such as figure 2 As shown, the device includes: a determination module 22, a merging module 24, and a calculation module 26.

[0163] The determining module 22 is configured to determine the RB-level interference suppression matrix according to the RB-level channel estimation value of the resou...

Embodiment 3

[0168] An embodiment of the present invention also provides a storage medium in which a computer program is stored, wherein the computer program is configured to execute the steps in any one of the foregoing method embodiments when running.

[0169] Optionally, in this embodiment, the foregoing storage medium may be configured to store a computer program for executing the following steps:

[0170] S1: Determine an RB-level interference suppression matrix according to the channel estimation value of the resource block RB level corresponding to the received signal and the RB-level noise covariance matrix corresponding to the signal after preset processing;

[0171] S2: Obtain an equivalent channel of the RB-level interference suppression matrix after combining in the space domain;

[0172] S3: Calculate the estimated value of the Doppler shift at the port level and the user equipment UE level according to the equivalent channel.

[0173] Optionally, in this embodiment, the aforementioned ...

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Abstract

The invention provides a Doppler frequency shift determination method and device. Specifically, the method comprises the steps: determining an interference suppression matrix of an RB level accordingto a channel estimation value of the RB level corresponding to a received signal and a noise covariance matrix of the RB level corresponding to the signal after preset processing; obtaining an equivalent channel of the RB-level interference suppression matrix after spatial domain combination; and calculating an estimated value of Doppler frequency shift of the port level and the UE level accordingto the equivalent channel. According to the method and the device, the problem that the estimation accuracy of the Doppler shift of the target cell is poor due to the interference of the neighbor cell is solved; in addition, the effects of effectively inhibiting the same-frequency interference of the neighbor cell and improving the estimation accuracy of the Doppler shift with relatively low calculation overhead can be achieved.

Description

Technical field [0001] The present invention relates to the field of communications, and in particular to a method and device for determining Doppler frequency shift. Background technique [0002] When the mobile station moves along a certain direction at a constant rate, it will cause a frequency difference between the transmitting end and the receiving end, which is called a Doppler shift. In Orthogonal Frequency Division Multiplexing (OFDM) systems, accurate Doppler frequency shift estimation is of great significance. For example, it can be used in 1) channel estimation algorithm to compensate the time dimension code division multiplexing (Code Division Multiplexing) of channel state information reference signal (Channel State Indication Reference Signal, CSI-RS) or demodulation reference signal (Demodulation Reference Signal, DMRS) Division Multiplexing (CDM) group frequency offset; 2) After obtaining the DMRS estimation value, perform frequency offset compensation when usin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L27/26
CPCH04L25/021H04L27/2601H04L25/0222H04L27/2691H04L27/2695H04L25/022H04L25/0224H04L27/2607
Inventor 张浩源黄俊刘源艾星星
Owner ZTE CORP
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